linux-kernel - Re: [PATCH rc v1 3/4] iommu/arm-smmu-v3: Ignore STE EATS when computing the update sequence

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Message-ID: <aTSKDmb2gqZb2Zne@nvidia.com>
Date: Sat, 6 Dec 2025 11:54:54 -0800
From: Nicolin Chen <nicolinc@...dia.com>
To: Jason Gunthorpe <jgg@...dia.com>
CC: <will@...nel.org>, <robin.murphy@....com>, <joro@...tes.org>,
	<linux-arm-kernel@...ts.infradead.org>, <iommu@...ts.linux.dev>,
	<linux-kernel@...r.kernel.org>, <skolothumtho@...dia.com>, <praan@...gle.com>
Subject: Re: [PATCH rc v1 3/4] iommu/arm-smmu-v3: Ignore STE EATS when
 computing the update sequence

On Sat, Dec 06, 2025 at 03:46:37PM -0400, Jason Gunthorpe wrote:
> On Fri, Dec 05, 2025 at 04:52:02PM -0800, Nicolin Chen wrote:
> > From: Jason Gunthorpe <jgg@...dia.com>
> > 
> > If a VM want to toggle EATS off the hypervisor will see EATS change to 0
> > and insert a V=0 breaking update into the STE even though the VM did not
> > ask for that.
> 
> "EATS off at the same time as changing CFG"
> 
> In bare metal EATS is ignored by CFG=ABORT/BYPASS which is why this
> doesn't cause a problem until we have nested where CFG is always a
> variation of S2 trans that does use EATS.

Ack. Will add squash these two.

Nicolin